SurfaceView和线程已经启动异常

Question

检查LunarLander示例,它使用该代码恢复抽屉线程:

public void surfaceCreated(SurfaceHolder holder) {
    // start the thread here so that we don't busy-wait in run()
    // waiting for the surface to be created
    thread.setRunning(true);
    thread.start();
}

这结束了:

public void surfaceDestroyed(SurfaceHolder holder) {
    // we have to tell thread to shut down & wait for it to finish, or else
    // it might touch the Surface after we return and explode
    boolean retry = true;
    thread.setRunning(false);
    while (retry) {
        try {
            thread.join();
            retry = false;
        } catch (InterruptedException e) {
        }
    }
}

但是当我执行项目时,按下主页按钮并恢复它崩溃的应用程序

 java.lang.IllegalThreadStateException: Thread already started.
    at java.lang.Thread.start(Thread.java:1045)
    at com.example.android.lunarlander.LunarView.surfaceCreated(LunarView.java:862)
    at android.view.SurfaceView.updateWindow(SurfaceView.java:533)
    at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:226)
    at android.view.View.dispatchWindowVisibilityChanged(View.java:5839)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)

我在其他示例中看到了这种处理后台线程的方法,但它崩溃了.它有什么问题？

Answer 1

你的线程仍在运行,我猜你没有正确停止它.你必须打断你的线程,或者我是如何解决它的.因此,不使用setRunning和布尔值来使线程运行,而是使用以下内容:

开始吧:

public void surfaceCreated(SurfaceHolder holder) {
    thread.start();
}

在线程中:

public void run() {

    try {
        while (true) {
            // code here
        }
    }
    catch (InterruptedException e) {
         //disable stuff here
    }
}

并阻止它:

public void surfaceDestroyed(SurfaceHolder holder) {
    thread.interrupt();
}

我只是快速输入,但它应该给你一个想法.